(19)

(11)

EP 4 081 674 A1

(12)

(43) Date of publication: 02.11.2022 Bulletin 2022/44 (21) Application number: 20845252.4 (22) Date of filing: 17.12.2020

(51) International Patent Classification (IPC):  C30B 29/36(2006.01) C30B 33/04(2006.01) C30B 33/00(2006.01) (52) Cooperative Patent Classification (CPC): C30B 29/36; C30B 33/04; C30B 33/00 (86) International application number: PCT/US2020/065520 (87) International publication number: WO 2021/133626 (01.07.2021 Gazette 2021/26)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 27.12.2019 US 201962954082 P (71) Applicant: Wolfspeed, Inc. Durham, NC 27703 (US)

(72) Inventors: KHLEBNIKOV, Yuri Raleigh, North Carolina 27617 (US) SAKHALKAR, Varad R. Morrisville, North Carolina 27560 (US) KENT, Caleb A. Durham, North Carolina 27713 (US) TSVETKOV, Valeri F. Durham, North Carolina 27705 (US) PAISLEY, Michael J. Raleigh, North Carolina 27603 (US) KRAMARENKO, Oleksandr Durham, North Carolina 27701 (US) CONRAD, Matthew David Durham, North Carolina 27713 (US) DEYNEKA, Eugene Raleigh, North Carolina 27607 (US) GRIFFITHS, Steven Morrisville, North Carolina 27560 (US) BUBEL, Simon Carrboro, North Carolina 27510 (US) POWELL, Adrian R. Cary, North Carolina 27519 (US) LEONARD, Robert Tyler Raleigh, North Carolina 27606 (US) BALKAS, Elif Cary, North Carolina 27511 (US) SEAMAN, Jeffrey C. Louisburg, North Carolina 27549 (US) (74) Representative: Murgitroyd & Company  Murgitroyd House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)